One thing that’s been bugging me with FireFox for a long time is the lack of MRU tabs (Most Recently Used). Instead of jumping back and forth between the tabs you use it simply sends you to the next tab whenever you press ctrl+Tab or ctrl+shift+tab.
Well, there was a very simple to solution available to solve this problem. It turns out MRU tab behavior is built in from the start. To get it working enter “about:config” in the address bar, accept the warning of certain doom and search for “ctrltab” and change the browser.ctrlTab.previews from false to true. Tadaa, now it works! If you hold in ctrl+tab you’ll see a window with all your tabs but if you just press it normally it’ll switch without the preview.